Star Schema Data Mart

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Please I'm struggling with the conception this is the Relational diagram of my database: enter image description here

so production order has only one machine, and it has its start and end date and quantity to produce. the step has the production each day for a specific order. what I did is I create a Dimension called production order that has (Start date, end date, quantity, and id) -dimension machine
-dimension date to design production date
-dimension etat (yes or no) yes if the production is ended (today's date > enddate)
-dimension failed (yes or no) if we produced all the quantity before end date
-fact is stepProduction has id_machine and id_ordreprod and id_date and the quantity.

But someone told me I should relate my fact 3time with the date dimension so I shouldn't put the start date and end date dimension.

so please could someone tell me what I did is right !! Thank you

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